[Hyperattenuating renal mass]

Leiomyoma is a frequently uterine tumour. Its location on the urinary tract is rare, making its iconographic diagnosis difficult. The ablation is often realized, allowing the histological confirmation. Renal leiomyoma have good prognosis. In our patient, the CT scan discovered a spontaneously hyperattenuating renal mass, raising after injection of contrast, at a 48-year-old patient. MRI revealed in particular a hyposignal T2. Because of its capsular location, the possibility of a renal leiomyoma had been envisaged without being able to eliminate a malignant lesion. The histological exam confirms this benign hypothesis. So leiomyoma is a rarely renal tumour, of excellent prognosis. The progress of the imaging allows the characterization of these hurts today and could, can be, in a near future, be an alternative at surgery.